// GenericsNote: Converted.
/*
 *  Copyright 2004 The Apache Software Foundation
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.jivesoftware.smack.util.collections;

import java.util.NoSuchElementException;

/**
 * Provides an implementation of an empty iterator.
 * 
 * @author Matt Hall, John Watkinson, Stephen Colebourne
 * @version $Revision: 1.1 $ $Date: 2005/10/11 17:05:24 $
 * @since Commons Collections 3.1
 */
abstract class AbstractEmptyIterator<E> {

	/**
	 * Constructor.
	 */
	protected AbstractEmptyIterator() {
		super();
	}

	public boolean hasNext() {
		return false;
	}

	public E next() {
		throw new NoSuchElementException("Iterator contains no elements");
	}

	public boolean hasPrevious() {
		return false;
	}

	public E previous() {
		throw new NoSuchElementException("Iterator contains no elements");
	}

	public int nextIndex() {
		return 0;
	}

	public int previousIndex() {
		return -1;
	}

	public void add(E obj) {
		throw new UnsupportedOperationException(
				"add() not supported for empty Iterator");
	}

	public void set(E obj) {
		throw new IllegalStateException("Iterator contains no elements");
	}

	public void remove() {
		throw new IllegalStateException("Iterator contains no elements");
	}

	public E getKey() {
		throw new IllegalStateException("Iterator contains no elements");
	}

	public E getValue() {
		throw new IllegalStateException("Iterator contains no elements");
	}

	public E setValue(E value) {
		throw new IllegalStateException("Iterator contains no elements");
	}

	public void reset() {
		// do nothing
	}

}
